S1 · Stainless Fasteners
Stainless Fasteners (316 Media and Boundary List)
List the media, grades, and boundary conditions for stainless fasteners related to "stainless fasteners": 5 typical components/processes, including recommended grades, specifications, failure reasons, and standards.
5 Parts and Material List
| Part / Component | Recommended Grade | Specification / Thickness | Surface | Main Failure Modes | Reference Standards |
|---|---|---|---|---|---|
| Hex Head Bolts (Full Thread) | A2-70/A4-70/A4-80/D4-70/D4-80/D6-70/D6-80 | M1.6–M64 | A2-70/A4-70 ≥700MPa；A4-80 ≥800MPa | A2-70/A4-70 ≥450MPa | A2 General Atmosphere/Interior; A4 Chloride/Ice Coast/Chemical; D4/D6 Duplex Steel Group, equivalent or better corrosion resistance to A4 with higher yield strength |
| Slotted Round Head Screws (Reduced Load Capacity) | A2-70/A4-70/A4-80 | M3–M16 | Same Group Same Grade | Same Group Same Grade | Reduced Load Capacity Design |
| Threaded Rod | A2-50/A2-70/A4-50/A4-70/A4-80/D4/D6 | Coarse Pitch M2–M68; Fine Pitch M8×1–M72×6 | By Group/Grade | By Group/Grade | Long Thread/Rolling Thread; Higher Tension Force A4-80 |
| Backbolts/Nail Screws | S31608（316） | Diameter ≥ 6mm | By JGJ 133 Anchoring Performance | — | Minimum A4-70 for outdoor exposure; A2-70 suitable for indoor use |
| High-strength duplex bolts (for battery packs, etc.) | QD2001/D4/D6 | M6-M12 common sizes | By D group | Yield Strength Higher Than Austenitic Group | High-Strength + Corrosion Resistance; Watch for Hydrogen Embrittlement and Stress Corrosion Interactions |
Table ContainsStandard ConfigurationMaterial selection
Consider usage conditions instead of grades
- What is the most common grade in this industry? —— 316 (1)
Frequently Asked Questions
What stainless steel is used most frequently with A2-70/A4-70/A4-80/D series fasteners and latest standards?
By total number, the most frequent is 316 (1 item). Specific to a part still requires looking at media and temperature, e.g., stainless countertops that contact salt water should switch from 304 to 316L.
Which parts are prone to issues?
By failure description, typical is "Hex head bolts (full thread)" with A2-70/A4-70 ≥450MPa; recommended grades A2-70/A4-70/A4-80/D4-70/D4-80/D6-70/D6-80, sizes M1.6–M64. For these conditions, media concentration, temperature, and cleaning methods should be specified in the design phase.
Material Properties and Related Industries
Weld Neck Flanges for Seawater Desalination: 2205/2507 PTCBDuplex Flange & DesalinationSanitary Diaphragm Valves/Clean Valves: ASME BPE, Ra, and Temperature BoundariesSanitary ValvesStress Corrosion Cracking in Sensitized and Chloride-Containing Materials: T-T-C BoundariesSensitization & Chloride SCC